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Priority must be given to direct warm forging of parts that are difficult to machine. It is also worth noting that it is necessary to pay attention to the coordination of the positioning reference of the no-processing part and the processing part of the warm forged part. The positioning standard used when the warm forged part is not used cannot be copied, and the specific situation should be analyzed.
The tooth width of the end face tooth shape is: 12×(36mm-28mm)=4mm. Considering the simple processing of the mold core block, the large end of the end face tooth shape is extended to the outer edge 43mm, and the small end end is extended to 22mm, so that the tooth The width is up to 10.5mm. This undoubtedly increases the strength of the tooth and helps to improve the life of the toothed punch.
It is good to release the draft of the warm forged part during warm forging, and it is not easy to scratch the die wall, so the outer circle can be considered as having a certain machining allowance. The height of the warm forged part can also be appropriately left with a certain margin, and it is also advantageous to appropriately increase the forging to improve the life of the toothed punch. The radius of the cogging and the top of the tooth is changed from R0.3 to R0.5, which is obviously beneficial to improve the life of the toothed punch, and the stress concentration is slowed down.
JH70 motorcycle face gear warm forging forming parts III. Original blank design for motorcycle face gear warm forging forming According to the law of volume invariance, the volume and weight of the raw blank for warm forging of motorcycle face gear should be the volume of warm forged forming parts. Equal in weight.
Due to the use of the ordinary cutting machine to cut the weight tolerance control of the blanking is more difficult, we design the longitudinal flash on the warm forged forming part to ensure the filling quality of the end face tooth shape. The weight of the blank is about 140g. After the weight of the blank is determined, the original blank height L can be determined according to the diameter D of the raw material used. However, the following two conditions should be considered: (1) L/D ≤ ​​2.5; (2) The upset pressure stroke curve of the bread cake equipment.
If the original blank height is too high, greater than 2.5D, then it is easy to bend when it is thick, so that the forgings have defects, and the deformation work consumed when the flat is flattened is also large, which may cause a boring phenomenon. The original blank size we have determined is 28mm × 30mm.
The design of the warm-forging forming die for the motorcycle face gear is shown as the warm-forging forming die of the motorcycle face gear. The upper mold base face gear warm forging forming template 1, the lower template 9, the guide sleeve 2, the guide post 3, the upper mold base 4, the lower mold base 11 and the like constitute a universal mold base. The concentricity of the punch 6 and the die 17, the die casing 18 is to be ensured.
Immediately after the original blank was pressed into the cake, it was placed in a warm forging forming die and warm forged. The heating system before warm forging is medium frequency induction heating. The warm forged formed part after warm forging is ejected from the dies by the ejector through the ejector rod 16, the lower ram 15 and the apex block 14.
When the toothed punch 6 is designed, the depth of the tooth profile is deepened to 2.5 0.1 mm. In order to shape the warm metal, the excess metal has a flow space, the forming force is reduced, and the angle on the circumference of the tooth portion of the punch is toothed. The diameter of the part is not less than 37mm, which also guarantees the drawing requirements of the finished parts. Participation. The center of the punch is designed with 22mm×5mm dimples, which facilitates the milling and grinding of the convex tooth shape, so that the grinding wheel and the milling cutter have the retracting space, and the extrusion forming force can be reduced during the warm forging forming.
Motorcycle face gear warm forging process flow process Motorcycle face gear warm forging process process is generally as follows: visual inspection of raw materials and conventional physical and chemical testing → shear cutting → induction heating → 镦 rough cake → warm forging forming → follow-up machining And heat treatment → inspection into the warehouse. The raw material is 20CrMo.
Warm forging was carried out on a 3150 kN closed single point press. There is no lower ejector on the machine, so the tie rod mechanism (not shown) is designed on the mold. Before warm forging, the mold should be preheated and generally preheated to 200 ° C ~ 300 ° C. We use a blowtorch to preheat the mold flame.
During the warm forging process, attention should also be paid to lubricating and cooling the mold cavity. Generally, water-based graphite or oil-based graphite is sprayed to form a lubricating film on the surface of the mold cavity, which is convenient for reducing friction and making the deformed metal flow easily, filling the cavity. It is also advantageous for the warm forging forming parts to be easily demolded. In summary, the requirements for warm forging lubricants are good coating properties on heated mold surfaces, high thermal stability, and low coefficient of friction. The temperature range during warm forging is taken to be 750 ° C to 850 ° C. The temperature is high, the deformation force and the deformation power consumption are small, but the oxidation is more significant, the temperature is low, the oxidation is small, but the deformation force and deformation work consumption are increased.
Summary (1) Warm forging parts can meet the requirements of users. At present, nearly 2 million pieces have been produced, and the products are sold to Henan, Jiangsu, Sichuan and other places. (2) Warm forging parts can be continuously produced, shortening product production cycle and reducing costs. (3) The material utilization rate of the warm forged formed parts can be greatly improved.